[AUTO] Add release notes for 3.6.0

[opensearch-ci-bot]

Add release notes for 3.6.0

Borderline Calls

• Add Calcite native SQL planning in UnifiedQueryPlanner #5257: Placed in Features — could also be Enhancements since it adds a new planning path to an existing query API. Chose Features because it introduces a net-new SQL planning capability (Calcite native parser pipeline) that didn't exist before.
• Change the final output result of struct from list to map #5227: Placed in Features — could also be Enhancements since it changes the output format of an existing command (graphlookup). Chose Features because it introduces a new output representation (map vs list) that changes the data contract.
• [BugFix]Fix multisearch UDT type loss through UNION (#5145, #5146, #5147) #5154: Placed in Features — could also be Bug Fixes since it fixes type loss through UNION. Chose Features because the label includes "feature" and the change introduces new override behavior in the type factory.
• Make sql plugin aware of FIPS build param (-Pcrypto.standard=FIPS-140-3) #5155: Placed in Enhancements — could also be Infrastructure or Maintenance. Chose Enhancements because the label includes "enhancement" and it adds new build-time capability for FIPS compliance.
• Bump ANTLR Version to 4.13.2 #5159: Placed in Enhancements — could also be Infrastructure. Chose Enhancements because the label includes "enhancement" and the ANTLR upgrade enables new grammar capabilities needed for the grammar bundle API.
• Add gradle.properties file to build sql with -Pcrypto.standard=FIPS=140-3 by default #5231: Placed in Infrastructure — labels include both "infrastructure" and "maintenance". Chose Infrastructure because it modifies the build configuration.
• [Maintenance] Fix bc-fips jar hell by marking dependency as compileOnly #5158: Placed in Maintenance — could also be Bug Fixes since it fixes a jar hell issue. Chose Maintenance because the label is "maintenance" and it's a dependency management change.
• Revert dynamic column support #5139: Placed in Maintenance — could also be Refactoring. Chose Maintenance because the label is "maintenance" and it's a revert in preparation for a redesign.
• Fix pitest dependency resolution with stable runtime version #5143: Placed in Bug Fixes — could also be Infrastructure. Chose Bug Fixes because the labels include "bugFix" and it fixes a broken build dependency resolution.
• added cloudwatch style contains operator #5219: Placed in Enhancements — could also be Features. Chose Enhancements because the label is "enhancement" and contains is syntactic sugar over existing LIKE functionality.
• Support creating/updating prometheus rules #5228: Placed in Enhancements — could also be Features since it adds new API endpoints. Chose Enhancements because the label is "enhancement" and it extends an existing direct query resources framework.
• Add CLAUDE.md #5259: Placed in Maintenance — could also be Documentation. Chose Maintenance because the label is "maintenance" and CLAUDE.md is developer tooling guidance rather than user-facing documentation.
• Fix typo: rename renameClasue to renameClause #5252: Placed in Bug Fixes — could also be Maintenance or Refactoring. Chose Bug Fixes because the label includes "bugFix", even though it's a no-op typo fix in grammar rule names.
• Implement reverse performance optimization #4775: Placed in Enhancements — could also be Bug Fixes since the old implementation failed on large datasets. Chose Enhancements because the label is "enhancement" and the primary change is a performance optimization.

[github-actions]

PR Reviewer Guide 🔍

(Review updated until commit 4d78671)

Here are some key observations to aid the review process:

🧪 No relevant tests

🔒 No security concerns identified

✅ No TODO sections

🔀 No multiple PR themes

⚡ No major issues detected

[github-actions]

Persistent review updated to latest commit 4d78671